Contents
1.0
Technical Specifications
1.1
Standard Model
1.2
SL Model
1.3
GT Model
2
2
3
3
5.10 Heads and Track Selector
5.10.1
Position
DUO
5.10.2 Position NORMAL
5.10.3 Position EXTRA
25
25
26
26
5.11
Function
Selector
26
2.0
Operating Controls
4
6.0
Alignment of Tape Path and Electric Circuits
27
3.0
Connections
5
6.1
Tape Guide Posts
27
6.2
Record/Playback Head
27
4.0
Mechanical Description and Adjustment Proce-
6.2.1
Initial Lateral Adjustment
27
dures
6
6.2.2 Height Adjustment
27
4.1
The Operating Lever
6
6.2.3 Azimuth Adjustment
27
4.1.1 Eccentric Segment (990203)
7
6.2.4 Final Lateral Adjustment
27
4.1.2 Pressure Wheel Arm (990202)
7
6.3
Erase Head
28
4.1.3 Operating Arm (248186)
7
6.3.1 Height Adjustment
28
4.2
Turntables
9
6.3.2 Azimuth Adjustment
28
4.2.1 Supply Turntable for Series 14 (990226)
9
6.3.3 Lateral Adjustment
28
4.2.2 Supply Turntable for Series 15 (990226)
10
6.4
Track Control
28
4.2.3 Tape Tensioner
10
6.4.1 Visual Track Control, 2-Track Model
28
4.2.4 Take-Up Turntable (990227) for Series 14
11
6.4.2 Track Control with Test Tape, 4-Track
4.2.5 Adjustment of Turntables
12
Model
28
4.3
Clutches
13
6.4.3 Height Adjustment of Record/Playback
4.3.1
Neutral
13
Head by Track Measurement on
4.3.2 Normal Forward Drive
14
4-Track Model
28
4.3.3 Fast Forward Winding
14
6.5
Bias Current
28
4.3.4 Fast Reverse Winding
15
6.5.1 Oscillator Frequency, 2-Track Model ..
28
4.3.5 Free
16
6.5.2 Oscillator Frequency, 4-Track Model ..
28
4.4
Motor Pulley (254040) for Series 14
16
6.6
Record Current and Record Level Indicator..
28
4.5
Motor Pulley (243940) for Series 15
16
6.7
Verification of Frequency Curves
28
4.6
Drive Belt (213997)
17
6.8
Distortion Check
29
4.7
Transfer Wheel (990233)
17
6.9
Output Amplifier
29
4.8
Lifting Arm (990201) Series 14
17
6.9.1 Output Symmetry
29
4.9
Lifting Arm (990201) Series 15
17
6.9.2 Quiescent Current
29
4.10 Flywheel (990312) with Capstan
18
4.11 Speed Selector, Series 14
19
7.0
Special Versions
29
4.12 Speed Selector, Series 15
19
7.1
Model 15 SL
29
4.13 Instantaneous Start/Stop Mechanism
20
7.1.1
Playback Amplifier
29
4.14 Pressure Pad Spring (Original Version)
20
7.1.2 Mechanical Interlock
29
4.15 Pressure Pad Spring (Modified Version)
20
7.2
Model 15 GT - Group Trainer
30
4.16 End Stop Mechanism
22
7.2.1
Input Amplifier
30
4.16.1
Neutral
22
7.2.2 Output Amplifier
30
4.16.2 Normal Forward Drive
22
7.2.3 Programme Amplifier
30
4.16.3 End Stop or Tape Break
22
7.2.4 Adjustment of Signal Levels
30
4.16.4 Free
22
7.3
Model 15 F
30
4.16.5 Tape Feeler Tension
22
7.3.1 Mechanical Operation
30
7.3.2 Electrical Operation
31
5.0
Electric
Circuits
24
5.1
Line Amplifier
24
8.0
Modifications
30
5.2
Microphone Amplifier
24
8.1
Circuit Modification for Low Noise Tape
32
5.3
Buffer Amplifier
24
8.2
Modification of F-Model from Serial
5.4
Equalizing Amplifier
24
No. 2 510 020
32
5.4.1
Equalizing Network for Recording
....
24
8.2.1 Microswitch for Oscillator Voltage
32
5.4.2 Equalizing Network in Playback Mode..
25
8.2.2 New Microswitch
33
5.5
Playback Booster
25
8.2.3 Rewiring
33
5.6
Indicator Amplifier
25
8.3
Modification from 2-Track to Full-Track Model
33
5.7
Oscillator
25
8.4
Modifications 50 to 60 Hz or Vice Versa ....
33
5.8
Output Amplifier
25
5.9
Power Supply and Voltage Regulator
25
9.0
Parts Lists
34
1
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